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Tier 1 capital is the core measure of a bank's financial strength from a regulator's point of view. It consists of the types of financial capital which is considered to be the most reliable and liquid, thus primarily Shareholders' equity. Examples of Tier 1 capital are common stockand open reserves, preferred stock that is irredeemable and non-cumulative, and retained earnings.

Capital in this sense is related to, but different from, the accounting The concept of shareholder's equity. Both tier 1 and as well as tier 2 capital were first defined in the Basel I capital accord. The new accord, Basel II, has not changed the definitions in any substantial way.

Each country's banking regulator, however, has some discretion over how differing financial instruments may count in a The theoretical reason for holding capital calculationis that it should provide protection against unexpected losses. This Note that this is appropriatenot the same as expected losses—provisions, reserves, as the legal framework varies in different legal systemsand current year profits which cover for expected losses.

The theoretical reason for holding More specifically, Tier 1 Capital is a measure of capital adequacy of a bank, and is that it should provide protection against unexpected lossesthe ratio of a bank's core equity capital to its total risk-weighted assets. Note that this Risk weighted assets is not the same as expected losses—provisionstotal of all assets held by the bank, reservesweighted for credit risk according to the Regulator (usually the country's Central Bank). Most Central Banks follow the BIS - Bank of International Settlements - guidelines in setting asset risk weights. Assets like cash and coins usually have zero risk weight, and current year profits are for expected losseswhile unsecured loans might have a risk weight of 100%.

More specifically, '''Tier 1 Capital is a measure of capital adequacy of a bank, and is the ratio of a bank's core equity capital to its total risk-weighted assets. Risk weighted assets is the total of all assets held by the bank which are weighted for credit risk according to a formula determined by the Regulator (usually the country's Central Bank). Most Central Banks follow the BIS - Bank of International Settlements [1] - guidelines in setting asset risk weights. Assets like cash and coins usually have zero risk weight, while unsecured loans might have a risk weight of 100%.  It is calculated as: Core Equity Capital / Risk Weighted Assets'''